Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5bed4a22582f4d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 15:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1555867ef680138127da2a607f9b8d10 SHA-1: c1c253b69af74a6d67f346996f96160dde2175c8 SHA-256: fc5bed4a22582f4d3ba74d5b555c0caad111f817f693e2e914484e72db222917
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters suggests a potential phishing or spam campaign aimed at driving traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=tambalang+salita+worksheet+ppt PDF link annotation
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/36264204509.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68027667737.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/465ec5ea74b0f11bcde4f43c2061840d/18842634795.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/likinanuzaga.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/80081309164.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/51c4b929baa219ad973c635479046b97/30831333439.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/57418532775.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2ebce779b184e878a444dd7cf5212aec/27961954064.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e48a7ac4d28---guxopoxudatorazotawaza.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/4839tf74nlkspgu0a86hp7f77t/59855769486.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084267d7d8ec---nugipukos.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/61961054705.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d94216677---35111787537.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/86455888168.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/xasulezeno.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16115967b59b06---57111706445.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/65bbe8339a8d15ba316528033526f1d6/fudodakutexisusobulapi.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/46750947144.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/jadafiw.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086386e0a4ae---82559467213.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/72759fecfcbea881b352ee9f182430a4/37510370991.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_off0000b9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A7 10980 bytes
SHA-256: 05382fbacfb045041e9251871f80b3a221459a97ef333c8539a52b21cffdbb49
font_01_sfnt_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 16264 bytes
SHA-256: 669493013efba6fe5a986d91490d8b930febc6013e6b4f6fcd42783580fff759
font_02_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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