Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bfb89cf738b88e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 16:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7bf356e023891b5db25ea42cf573140 SHA-1: 5e76849424ab95f3e974a171fd08a15d9ed9462e SHA-256: 42bfb89cf738b88e4734d8dbbbcc4b70f8e538cf47a9598864d8d007e2b9b652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including one pointing to 'allytemp.ru', suggests an attempt to distribute malicious content or conduct phishing operations.

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 https://allytemp.ru/uplcv?utm_term=athena+in+she%27s+dating+the+gangster PDF link annotation
    • https://bdlvn.com/steel/upload/files/835272300.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/81400574200.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/riniferu.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/jopewo.pdfIn PDF document text
    • http://afro-safari.com/upload/files/sotaxikenovek.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/55111142886.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/37817088320.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/vagixidasimogazomerus.pdfIn PDF document text
    • http://njchemland.com/upload/files/guvowubavez.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/setanadodosaxozez.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/gukuwo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f4cde5e2---4559751035.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/40958703574.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/56030898800.pdfIn PDF document text
    • http://kelsenator.com/userimages/tokepimavagunumasevufe.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/519151642.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcd9760c3---25343288307.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/12260905194.pdfIn PDF document text
    • https://huanghecables.com/d/files/beligunobedezazegumeralu.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/tosonumaforawigojaxo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f261cba0cc---71187394794.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/87951767865.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_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10376 bytes
SHA-256: 2b88ec0712009884c3fa49dccdf4310abaef63c547ce6055adb41e51c57fafe7
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 18660 bytes
SHA-256: 2e3f3975ad19b053859d0530fcaf068012d5059f4a7268572644151c97c860b0