Malicious PDF — malware analysis report

Static analysis result for SHA-256 14247eef6f44852c…

MALICIOUS

PDF

116.6 KB Created: 2021-08-13 13:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db679121d53e3ec58a667f6666641a2c SHA-1: 3e0eb0b64ac3b24adc7f8f6a1012a15ab1accefa SHA-256: 14247eef6f44852c6891b44d2a1288c083b38ff72f88e864295270a526db0ab0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4srjbvrtb6lsb5dtsus38rft70/25739081650.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160907f9805a8d---10358047634.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/bofujitizafi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o8h58n465tte1klsmu8lqv48n0/10199999209.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mamawidetolugivakel.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/80251212544.pdfIn PDF document text
    • https://visualarchive.bg/files/peborusanoxa.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/37289102085.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9fe53cda8488298d3a437f32c9fa8855/foxanatogugad.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae92125841f---wuritilasujugejafavapabit.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/fonolewosinokine.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/20868446875.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fee6c3eeec---14912642959.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/27900620791.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160793813f1ab0---14807246654.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/jumedorokerozofetela.pdfIn PDF document text
    • http://fskyok.com//uploadfile/files/62468352377.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d82e095a16---nutefepuz.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db77eef7fc---35308152880.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f0d5b0d8f---94792681164.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ba40081ae5d917da61e5d01bd0e78b3/lapofiwefugagoredopuz.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b69049aa8---56070486843.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/abca95335d37e998e6b3802f8d76b5e3/vanuxo.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/panawisudilav.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/38529394718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cube+escape+seasons+solutionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00016f64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16F64 21308 bytes
SHA-256: 8b1a0eeaf67522f5bde51a90145235420708876c48f8fe0cd7fe724e8556814b
font_00_sfnt_off00013ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 20720 bytes
SHA-256: 3e3e1dc12933055754365d51bc24590c461b6afe7c535c0d6e8d34aee1e5a879
font_02_sfnt_off00019467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ac7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC7E 10536 bytes
SHA-256: 52d14b2a2364ef246757148af5443406020d097b6a7fea1a85b8b45be6d877e5

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