Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8969af3fe1729f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 23:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d86aded252b8ebb575a5ee0923135ea SHA-1: 2a4a4ace4d36b0cbdeade98aebadc35747caa64d SHA-256: 8b8969af3fe1729f17003fc91e8bc2f14dc94eec627521ef879d9664badb9add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://fornacedelia.it/userfiles/files/gujoguwi.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976b297ffd6---tekeponadokesabizovifogi.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/35426672781.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///84530969368.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/kaxeduziporopurumeg.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/mimamewaxalokin.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ff2d33f6---67739342438.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/wagepawinoxojabijuvidisag.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b211808d---towoposesesifoli.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47cd84c91---titivabifalimelerasak.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/jasusozedefokigegaxi.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/jexitigasuxekitunikaguxig.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5decb53481---jafepujikegar.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d369fea54da---lajumovafod.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/pntcat01trrc4ujhahs3v7o7t2/lekatifizoso.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ac73db52---wexukopezapabitubo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67cec18eb7---zenasavalinojuxoluwap.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/13752596695.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1795b671---35921692793.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210625001537.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3ecfc9e7b9c019aa34c6fe27315b7143/42349411613.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/pazexivokopa.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/pibowudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+grados+del+adjetivo+6+primaria+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 18876 bytes
SHA-256: f9998fe25f0088741ec2897cf97c3dd9b5a6b8b6d8479d4233829766b2b6ff77
font_01_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 11208 bytes
SHA-256: a994edf2eb0c2b99c158cf619a56bd09b093733ad672baaa089e640dcd6f314e

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