Malicious PDF — malware analysis report

Static analysis result for SHA-256 0498ee4778d13142…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 01:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3c898b1f70119474ee5466bfdc41354 SHA-1: bdd88595e465d7fd188b3872cc3a97cfbd440b09 SHA-256: 0498ee4778d131421f5a0afd9545ce90392fda3323def5da728fead408eb287f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/9f1940c4441ceee1406b1ea88f54bcd9/peluwemevepotujixolarew.pdf In PDF document text
    • https://kaptenhoki.com/contents//files/tinikal.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/8eb5f5553fba15a976f66de19753e942/27413011872.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/genobenabegafulidi.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/57786291629.pdfIn PDF document text
    • http://rubensova16.cz/files/file/kisalu.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/71950318778.pdfIn PDF document text
    • http://cjatkinson.com/userimages/modujekifag.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zakewefiwu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1m5efpqttoulgjo7n04r74vqid/dafopadovukutuxafixore.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096e65c69b6f---2625066109.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vilegoxo.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/74420420177.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d018e1da045fb01e41a1d14b12490e53/nowakoxulod.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094780757fd5---daximuxiniki.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bff1bf959a61437a6c659a2ebe98ec99/75628399241.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210716_04296C8FB461B068.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/jatasumufovef.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bc5hea5hqjaenntl44pskf59o7/nukuninazonul.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/bowosasekezuma.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0b30d18ca8a7debca5532c7df7ac8031/mexodijubibowoge.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/14941955664.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/dawepeliwadepedasiwekexi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1ae8f4bcee5bde8d963a621d9c0d2706/denadudilovarebadoxonub.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c7417b244---49201049411.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/14745965972.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/wejuwejobibes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ept+practice+test+pdfPDF 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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 10324 bytes
SHA-256: 6b5614da19d221f590b73cb1ed3a26f4082e60652d5b2885870c14be2cae0ebf
font_02_sfnt_off00010aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABA 17620 bytes
SHA-256: 4ca9189f3cf49bc3c26ee27cab4c74842be8f13472b61c960a4da8658f130f29