Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc658e782e2d836b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 08:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 191e5204bd02f16b2bc58231929e84de SHA-1: e113d98fa951c7dd6365458484644ed9d63d6704 SHA-256: bc658e782e2d836b7062afa789e5ac62d01d6ce6f9fe659da613116dcc360508
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious content. The presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sevinctekstil.com/resimler/files/62560094213.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qr2k8sius0rnmid9k99j9jh0ss/ganoxibikurubuzafuzep.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/63788142055.pdfIn PDF document text
    • http://getvisa.ru/images/File/dawixerovudagununem.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/61548607744.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/ruzukifemovikexi.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b77562c6---8951601500.pdfIn PDF document text
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/5dfcc808d4f93ddeba562e0320c5a547/21122909290.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/59750710609.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/91951875254.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/rebijikex.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/5459919781.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b6f45767---wufesefiwatifa.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sanam.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/mavuzijigifugivug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e10b6dd15---51541496907.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bb328e2c560a88a07b181a03aa7f93f7/93900258081.pdfIn PDF document text
    • https://wsbtitan.com/images/file/wujoposusepolizabo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b1be7aecc---tajexosekowiwixeku.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202108242343057152.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f46b41d19---26712076424.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/35097597307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=seven+days+in+utopia+did+he+make+the+puttPDF 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_off0000b755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB755 16408 bytes
SHA-256: f1743e34245b8682c9d5f7018271f723b3d41a36f9344d18650035b75a920148
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10960 bytes
SHA-256: 8ede96533fa350ff5e23d2a4b7f5e749d764924ccab5914a3f7cf8eb28ab95af
font_02_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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