Malicious PDF — malware analysis report

Static analysis result for SHA-256 d228af0b66a7f892…

MALICIOUS

PDF

86.7 KB Created: 2021-06-25 20:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 54cee2fdb47760837f3b1d66b277d024 SHA-1: aa851583729e94d2cf08cbd015528df1ec8694a6 SHA-256: d228af0b66a7f8924fb867805b22dd3f50783ccddf7d75b0fb23e53cc3c56636
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of links, many of which point to other PDFs hosted on compromised websites. This behavior is indicative of a link farm used to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cakenepal.com/userfiles/file/zokume.pdf In PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160931cb3b484c---69558351142.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94289a74b---wizojoto.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/1deeg2hip5ikhm6qtfegqdtltq/serozar.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f6ccebfb5866d17a7fc67f40b834d527/61862427406.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9qjscjf7fla0ral5aholkrhc00/tixaxupodevawulesigog.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2218edb550e2dea46e6aaeed42495b7a/relemogog.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0rse3medpdvcd2ib09274js82o/31926393471.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/re3ot3uovvl8tfgut6cpb0t673/masadomababesijila.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/163085e97535c1b3f10143efb30ba78c/mudosamajorokegifuze.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/lafonib.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3aa8ee0be6cb0ad69294d128d3f51b6c/pabewezivos.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075341d54df9---sikaduf.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607be760daf94---94571841834.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/368049842.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zububenazategarafemiwut.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/oo008jr9svgp19qnf6j6h5jjnf/fetatavux.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54f6080ea---xawejidifi.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/zimus.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/gexavok.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/megojeb.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wejodavudesid.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c863444d1af---pukezofunutezidetazelura.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/60763df4aecbc2359765efd18d89175f/48682800072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=this+city+was+the+center+of+commerce+and+culture+in+the+hellenistic+worldPDF 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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 11004 bytes
SHA-256: f67ab54945ea2526dac45eda598cfab4ac8f81ea071ded5a8f1bf468ea1ed832
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 17944 bytes
SHA-256: 6ac825ec36fc83d7c92753e76863c378dc97032f420056a5343b487cb8f8ff31
font_02_sfnt_off0001347f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1