Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9abd3bb4467212…

MALICIOUS

PDF

87.3 KB Created: 2021-07-12 22:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: be709a193df54ed8fcca69cd42a5d649 SHA-1: 93ee2563db5f005b2630726506ed25d8e915fe79 SHA-256: 7f9abd3bb44672121bcbc4375e16831a2b144994d2d5dee955aa2249d9b3561d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations, 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. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings are conclusive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/72347e02d17f2676d9d94bdff2261ad5/16154684661.pdf In PDF document text
    • http://auapp.ch/userfiles/files/zosisofawekevasule.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-20/20210620190406808574.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90e381691---ganiwijokojevajaka.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/fubewojuxi.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/kipowikifefag.pdfIn PDF document text
    • http://zuche0551.com/upload/file/tugamojafike.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2455e42ee---doxemudazimudepirinubuvi.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/mazadapini.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/085eb5aedd9cc4a79f80bd57efa8eb7f/talapuxov.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949152b7e0b---1947919926.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tidivivasofu.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/230f51uo84ludb1vc9nd7886n7/purofugele.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b64db376---49216401814.pdfIn PDF document text
    • http://africareview.in/userfiles/file/lexaxukafimon.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce5ca72ec---vozejanamibemu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af95badfc72---zatixenesujono.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/8n94b6t2jbarb42c1l2d3fe5b6/zerokazolozifuwudorerataf.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/7882669ca6779a7b3df6ef3f7f40711f/gikuwot.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa3bec64f---20938361010.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/65558845786.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210614011848.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7lpomcsjsh76fmjr2cfb400e66/zagaramipivazifasire.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e6ebb7be734608e587cdff4860fa778a/61340900303.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d122ed617e---52020244502.pdfIn PDF document text
    • https://webmenuplus.com/images/file/suzitepodedekemasukibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+happens+if+check+expiresPDF 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_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10600 bytes
SHA-256: 92216f000a04a876ca86a9a6307b1de809e77f025aab8d58b315d48bb0d1ecf9
font_01_sfnt_off00010c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 16940 bytes
SHA-256: 25d7371811744598a6bdfc8ec05842621050e1f960dd011fd3965cdbb7c637af
font_02_sfnt_off000137ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1