Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e12172e3e15737b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-30 14:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 85c32adde70f6cacebbf53ac146e432a SHA-1: 3623a9ecd6be6b83ecabb27ae162d8acf5f868e5 SHA-256: 1e12172e3e15737b6fba958c4e6e7891e302d94f56bb8a713b4ca701ea2d3e48
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ttccid.com/userfiles/file/buworagasikowil.pdf In PDF document text
    • https://netron.pt/app/webroot/media/files/sidagajoxotugubadevivad.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/55704352462.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/koronuwakosukuwe.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/nujamewomovifukivotavar.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ab272314---vatemekonogovir.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/panijupumobipipapo.pdfIn PDF document text
    • https://eniedu.com/data/file/20210914131849.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/74102457595.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/xitef.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/dakoxajabupijimo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/33090380990.pdfIn PDF document text
    • https://hobbypet.cz/files/file/sifijevaxomasasomi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff46ace2da---xisevarobedikemes.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/87991877968.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/burezuzutilijaxekadokamu.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/zikasevonoduvesagu.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/98564907951.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/tunudujaxuto.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/84196096942.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/22447907058.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2cf3d6e43---tobaniwulu.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/falutukazuxurugugeduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gta+san+andreas+cheats+ps2+never+wantedPDF 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_off0000b800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 19500 bytes
SHA-256: c21a8ae16a08a0ddb8c537145090902a92994c7657c3bb37ed4a96f96b432f0a
font_02_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 10664 bytes
SHA-256: 3659caf801050055fe6e3dcd5de6d0e98b7ed63f1a3e96875bce168d636b5d32