Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e020015f860bcb…

MALICIOUS

PDF

87.2 KB Created: 2021-09-03 17:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bb8b9f73198a6fc05691c15c4d1fbb4 SHA-1: e996f169b06b227f89c67b7281caed87618435a4 SHA-256: 42e020015f860bcb9f373806857cf0457471a46b1ff5bbe78dd0befcb16a5c9d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=motorola+sb6121+user+manual PDF link annotation
    • http://poiskvod.ru/images/file/37766210290.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/16689632485.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4d5586503888bbbd819cbc5a7355fa0d/sugixuz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170e4690fc5---35989126586.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121761634d02---jebakulafenutap.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/majalopegozijekopejarar.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cufprk5hudbh3oc8r2k52bmh1u/zebodu.pdfIn PDF document text
    • http://modern-pro.ru/files/file/35720709756.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b86a83a58bd97431bbdd4fed817cd50c/2928173192.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5de69c275---kasav.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/86823227888.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/sivuvuxava.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/56544601003.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aaba1a2ab18905cee7e3a0ea18ea3e05/92749503953.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/unorarapajud.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/pisagupuduzukoroku.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113c5a8826e6---bitumesikewizatabadopuzok.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/mofuzexaju.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608748a2a16d5---31849208310.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/vixukigivatuwebidisaze.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/zumejijusuru.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/bizopoxotitagi.pdfIn PDF document text
    • http://tcihk.com/userfiles/sarojekubonejodadusu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/rinukefozazokiniwuzig.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c183cb10c93---65266353936.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_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 18392 bytes
SHA-256: 3638fe928ece1fdcf1d0b2d41ff3984ac2bc937958ffe3beee7e5249466985d1
font_02_sfnt_off000135d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D2 10748 bytes
SHA-256: 5b66a445b5bcf8beb755f442fbd9eaf81c527542408efbd52091b9cbb4a5ba8f

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