Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c76cab333363e53…

MALICIOUS

PDF

83.7 KB Created: 2021-07-20 00:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb9a0d7ffa2b346ed210099c31cc2943 SHA-1: 0a457667292181d829df72d7c0bd980ea8071384 SHA-256: 7c76cab333363e535bfeba19d7389703a6f66042fe68ea2b172831f87b8e13b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains malicious links. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dok-vo.ru/userfiles/file/28368944253.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/mfv1m2f950h84pn02ihh90rfb5/2582117056.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/o139bbenadpud6aqoebmjcqhh1/solesulesabowowu.pdf
    • http://beloezoloto.ru/userfiles/file/gogezefeg.pdf
    • http://www.florentmaussion.net/userfiles/File/tokobaneb.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/66422931904.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a7070bf4641750d9ea4ce20e5380c7c/limusegebune.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gegvsef9lnn36vjqe37op268km/14629050231.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9fd5ed2a15a0a0cadc1ef1a8fddce9f0/48001594025.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/647bfa52c5ce19b5e56d2f2cf71ca4db/33850034287.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71d26f3320---telig.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160758d3b546fd---67683717312.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/nhcmconmchq0teiver5qbr0f16/sabed.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843957e4339---zefefonasoxikutasu.pdf
    • http://driver-jazda.pl/upload/file/32654783672.pdf
    • https://idd.no/ckfinder/userfiles/files/56260981557.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad5e85c1e9---teluzidutusaw.pdf
    • http://hongdanhaudio.com/luutru/files/89561042023.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53d4d98bc---xokugavora.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f81dd3c366431f6ccedf91ea0ec4fc37/jezibotiketale.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ic5o0aj9q8cg6ovpi7athjt0g6/96580959587.pdf
    • https://npkfertilizerproduction.com/d/files/4433800884.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fibrocystic+breast+changes+in+one+breast
    • 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_off0000e63e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 16792 bytes
font_01_sfnt_off0000fe55.bin
be2d0199091b05841a8e5b22b28834492378f800d55ef9842b6a4d5dec6d41ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 10696 bytes
font_02_sfnt_off000116db.bin
c8ff6d1238b55aedcf79db13fdf3898311bf3429ce0d07bdd95306fdc1bc65af
pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16444 bytes