Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6d9979c2ebb295…

MALICIOUS

PDF

94.1 KB Created: 2021-06-30 01:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 92d0c1cc7b5fd0ef1df757ade1777b04 SHA-1: 981c5edbb0ea2033d3eea19918d5c806f0495ba2 SHA-256: bc6d9979c2ebb295fc1bed86f8153af25805ff6621b5746002830735df174d31
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable infrastructure. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/59906aea6eaeaf65980461613ae104a2/67383950646.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a692703ec1---25520489500.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vedotamulumotadofasexizo.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/39748101581.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/60ec986723af8baab0ad445b8a9813e4/73174376713.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/79336913061.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nirogamuvigezirutalaloles.pdfIn PDF document text
    • http://beiks.info/public/file/94672747854.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b04f3ab1f---1786290808.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/9moejge2dbil3gn4164bqiqsf6/59869373657.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdc9fb45f4---19370295242.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/crd37abqv925ua0kghoo1evlha/jipenevolobiretatikum.pdfIn PDF document text
    • https://migger.dk/userimages/file/5238721988.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dbd2b614d---guzitif.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/7287115040.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/mnb2n5jiqpc51e3k7b5nfo7h06/vireroxonovifotu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a37ecdf9d8d80189dff25a382b5be7c4/wanasufurixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sales+of+goods+act+2002PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/jelirirobonem.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_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 17876 bytes
SHA-256: e01048eb63ea37c5c3ba77d1adde35719a6470b6458948e62a89c3c78df979af
font_02_sfnt_off000151d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D0 10672 bytes
SHA-256: 3367ff1de675a5e4a5f0011f625957ac37bae890f9ee1a581da15f8f4981732e