Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06662393362c7b7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 00:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cb084ff37dcf9b4ed2dba1b47eaf06c SHA-1: 4b1f791394a77c2c2a8b6f4b8ffebd81e3d2977b SHA-256: d06662393362c7b74b3b6f21e280fd85afaf8d39d38403f3a9e408660e7ec580
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the presence of numerous external links is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://polymer-optix.de/userfiles/file/7318797945.pdf In PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/93139631821.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mojajarafukuruxiroru.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/70510228763.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613736b483204---furebolobiwisozufexol.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/215b945f6b2eb82366c3a4d028bbe730/solunugi.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/86581073121.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/37767197207.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/zesixuvanipigivazegad.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/55204628723.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/2970597130.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/5323630890.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/079d5f081ba6614eddc7d2df4a8fe7f4/rowun.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/sipavudetivibuxiriwagonu.pdfIn PDF document text
    • https://beautydent.hu/editor_up/magixobudukawebavaloj.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vosusarakamexiw.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/60467413228.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/dawowijerezodiwuki.pdfIn PDF document text
    • http://irollee.com/userfiles/file/makewuzafixanutazomulal.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/zamef.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/51001758173.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/42587382062.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/73525998385.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lonoriliken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+enable+text+to+speech+in+androidPDF 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 10928 bytes
SHA-256: 38faabc6a2c8ee78238213bc7367830bb191486b28022cf20ea349437d1a494d
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 17968 bytes
SHA-256: 8b7744d57eceda83200462542f4a04d0a4f45b64e2f47554c740a3ffb3e470b9
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1