Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1b44c02879f0af…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 21:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 154950fc1f05ffc6158479eafad5f637 SHA-1: 620e6284ce4dbde5907d7d9d697d87e9adb93a2e SHA-256: 9b1b44c02879f0af1c3a6c304d7dd8baf438968aed01ea9ee3f899cc84254b32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, and contains heuristics indicating an advance-fee scam lure. It also functions as a link farm, pointing to multiple PDF files hosted on compromised websites, likely to distribute further malicious content or phish for credentials. No scripts were extracted, but the document's structure and URL patterns are consistent with phishing and fraud campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1nqe5v45evt8vu890ei5t1ln00/pufax.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e343c98309---45858531134.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731e8b06129---lixene.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab9fe499e---35232318497.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/paroremekusoz.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d94c7f62---gevirofokujamu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1mbm7fivhd1fn4mql8afsh1a0p/68072403551.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jixoxemorosoxekobemi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tofuxigugi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2f3c85c024301977ea75f38e073eacf2/nevudurizobidobe.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa8b77849---19294942258.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/6293709444.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4d37e74e65f06a7e839f82b153d49f35/71968144610.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949fb311018---dalofazajofu.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://softwarefactory.nl/images/file/pakowogefalevepoguzezerow.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/degikatoxitumonimu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7bb0d18db0fa9587115d9048e3ac7141/folivobifalexina.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/85509364179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=highest+salary+jobs+for+commerce+studentsPDF 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_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 17788 bytes
SHA-256: 9b9f9f8afd8e4cdc1b921f214ccd0fcbb939f10dd0a6d6077c7be95f7660d90c
font_01_sfnt_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 11400 bytes
SHA-256: cb94598e3df550abf7e0dc0c043f92351c018f11186d6432131d7e2057bc2426

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