Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e741881d6a2ae7…

MALICIOUS

PDF

105.6 KB Created: 2021-06-28 00:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0037584e4fed3092d7862a8735a4923 SHA-1: 28aaf22aa6ac4c8ed7409bb0e6996376ca7790c0 SHA-256: a7e741881d6a2ae71d6885bdaab02a0c1b6442c8bc87f2bea49795bbe0f816b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to compromised CMS uploads and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://imhkayseri.com/resimler/files/41681145039.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/eb44e36f831ab475aa3866a97e979234/49861329670.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0292ce6369---61710793615.pdf
    • http://provia-events.de/pics/fotos/1/file/sulemulirafovivimaxapawam.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/lhkh7osjs4me2qr9fldgg6rlm4/niretam.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5ba6b2d78340739e1e9e0366119d0805/rogavupokinodago.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3242a32f3---88797483171.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/k7t3cdee7c2nvdiocaufvdejna/17497320975.pdf
    • https://powermailer.in/userfiles/file/41855113846.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb56ce4f8---41636067923.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/33f25128ad4cdb492c640ad93a63b525/simowaxojasubadow.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b568f4ddc0---8968644657.pdf
    • http://j-club.eu/userfiles/file/20691957457.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a775883e455---90845507862.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ce41c335---fikuxizenevomose.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ebc3371bdbe44b188f65c2e213a0e2df/92589698379.pdf
    • http://tuzvedo.hu/elemek/file/narugo.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/06ee5540cae72bbe48279b4a7536f844/50732062176.pdf
    • https://tramhuonghanoi.vn/upload/files/didutiwuwomimo.pdf
    • https://aquafilling.com/userfiles/file/63205742295.pdf
    • http://appartenvue.net/appart/upload/images/57963481811.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/678b3be3df7a647d6e94290f40efb94a/paxekobagetudaxa.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b9ce645b---fofikobije.pdf
    • http://creatinglifeoptions.com/userfiles/files/kubadebux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cares+act+student+loan+forgiveness
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ade.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADE 16792 bytes
font_01_sfnt_off000152f0.bin
79c2d562fda8216cd91831d147d3aad4e8873d3120f9e389abea271fe435b189
pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 17152 bytes
font_02_sfnt_off00017ff0.bin
4a447905ad2a4dd69e4e1475d1e66f28d4c0274ed7090addeef4fc8129338405
pdf-font-stream PDF embedded font (sfnt) at offset 0x17FF0 10848 bytes