Malicious PDF — malware analysis report

Static analysis result for SHA-256 78505ac04eaf747d…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 22:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5511944737cd68c24cca300feab64601 SHA-1: 57db3041a59883b6a841ca859962003516b05f02 SHA-256: 78505ac04eaf747d8790fedf2dadb81e1cdc1c17a98751e3af16c99ba3fbaa7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 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://pakianco.ir/data/image/uploads/news/files/rozazobepimaw.pdf In PDF document text
    • http://thepokeluau.com/uploads/files/58942273123.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/19213171194.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/zubozujoku.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fisapalom.pdfIn PDF document text
    • http://teplospectr.ru/images/files/tidazixikelibozo.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dunorapujuwamukilemi.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/metiledomotenazediburuzu.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914030307.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rabekadazakuxike.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/subapenakemisafigovud.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210925/file/tuzitu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143982bb90ab---binotinitokinafavibi.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/17672429918.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/71257786794.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/nilusoramazufafun.pdfIn PDF document text
    • https://ghnservizi.com/file/38658016449.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/dadofabugix.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2f0a6c69---kesom.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4e6468d85ad9c3b4fc173d968bf5b9bb/49420949397.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/makasesodabemaratiredol.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/wusewiz.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/lutevosotudasimekinoxuzif.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/pawekukuropefutopaxit.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/77825938403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=slave+porn+game+androidPDF 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_off0000b3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A0 10608 bytes
SHA-256: 60f748db61770ffa6b1f46c2818ea39d3fa5410629e43b8e1ff28eac7c4a7c06
font_01_sfnt_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 17220 bytes
SHA-256: dfb580353c66562f9512b197afeb02351b500d83793ab17bf89eca1bdccd97af
font_02_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1