Malicious PDF — malware analysis report

Static analysis result for SHA-256 affaeee6076db05c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 23:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a583fee16ae2b86e7ae0d5d93e43328 SHA-1: ee593952cf97f96ddfea7d9e2e18f177d4a309c6 SHA-256: affaeee6076db05c07d22beb475f312ac0bb0bbbe729f0855e3c588d39ad2f20
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to potentially malicious content. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://smidgel.ru/uplcv?utm_term=umwandeln+in+pdf+kostenlos+online PDF link annotation
    • http://jshtextile.com/UserFiles/file///muwavopap.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a4ff3c3bd544dc04f99737eaf4ab4dcb/59101338145.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c02f1521---12811802321.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b79ff087f24443b9f1547b4e23c134d8/waderamunupaveju.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/kixotobowisavuwori.pdfIn PDF document text
    • https://rajaunited.com/contents//files/5146559539.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vesalawes.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/nezibudufozazobu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1f08af90---29264533146.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/52499789999.pdfIn PDF document text
    • http://islandpointfl.com/userimages/86739297990.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/guparurafunabatumabixopo.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/88dc36b77aab27a5c372d4ecf64c2aa7/1202208430.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c848c7f900---43880388260.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787e848c9fc---varobilatuvujareromup.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/nazipasixomorasabitelig.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210802134512.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/47977936103.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/xabag.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/87979004450.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/83640040138.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/13211400822.pdfIn PDF document text
    • http://test-immo.com/file/jokavegewapoxumivef.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/jinenawujapomolabomota.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0378061e8f3313b2cd441da274490310/38420718917.pdfIn PDF document text
    • 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_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 19784 bytes
SHA-256: 84227c2975e0cdc791e8451286f105a6e49b36c2b145886bfa018909b656fca4
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 10744 bytes
SHA-256: 9346ccec5fed9a70286b1b9d1e4c2cf95e4fa6608196289d53cd63a408e6c508
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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