Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf07f78c0ec2e965…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 06:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a52664a6c0f3f46bfca0f102e1cf109 SHA-1: 5babdf4eb4a85fc993a6c4cb74fd1a1a93322e51 SHA-256: cf07f78c0ec2e9657f5d46ce4f1d472ac4d59ef5c0aa86662cf367e13c340a31
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, designed to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL findings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://airelimpio.mx/img/editor/file/3741834287.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ppm5rbu4qiba37308fd39d2ggm/82198846781.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c97a155b546817754485142cd0b0c819/miwovedoxofudejo.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae736402a0a---fabarexizajan.pdf
    • http://k1a.ru/images/files/file/kadorofunezajekika.pdf
    • https://sasalidayanisma.org/uploads/file/rujugasodafekejumo.pdf
    • http://www.sport-konyv.hu/userfiles/file/vinadotaditefikejisawabaz.pdf
    • http://kovacsoltvaskerites.hu/images/file/lekifisenadate.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87f75990d---41387884667.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe93c2779c---xezezinaradezoneregarin.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mugifemukoke.pdf
    • https://thinkhigh-tech.com/d/files/71130341005.pdf
    • http://sanarina.de/ckfinder/userfiles/files/dadubowenev.pdf
    • http://thessalonikiflights.com/files/files/dagewiresatifulubefareruw.pdf
    • http://laclonghotel.vn/upload/files/losonopogika.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/1017187882.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6gok9o5fns42iq9sv43tt39bj6/nobalava.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/dixarizugolepowamaw.pdf
    • https://cafesca.net/ckfinder/userfiles/files/norinebunujitegar.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070697ca8709---vowajifu.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be52e372b30---pasusewirolatir.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951b40ce5cc---zezenawivoxulemifagosur.pdf
    • https://fokusmedia.com/images/uploads/sezapipalebomegadawexup.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/210c0068e55dfe2e4c7fd83d10ae713f/turev.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/91b51afa15aa3e0bce388cdb57128ee6/xijawozagavijofubaxos.pdf
    • http://zkpower.net/upload/files/ganopositasuwomoxabenode.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=two+types+of+lubrication+systems
    • 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_off0000e78d.bin
bc55b169d2378b76fd6afb17a5cd3d58929b4fa1b03309c47c8e1fbafd717a1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16348 bytes
font_01_sfnt_off000111c3.bin
fec384f4158f01028d64bc3b51e2c1f787e5078930e6b08bbdb0dead32f9301e
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 11044 bytes
font_02_sfnt_off00012b5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 16792 bytes