Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db91da0a9fe70df…

MALICIOUS

PDF

97.0 KB Created: 2021-06-29 08:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54744d888e43bd1fc0b3a5f0f065db19 SHA-1: 08ee2895fd8614995203db2a1b8248360533e321 SHA-256: 2db91da0a9fe70dff4d25d7387234699260d1feaa6add198e7e60513c9214bdd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://krisoc.ru/uplcv?utm_term=how+to+make+paper+lamp+shades+at+home+step+by+step PDF link annotation
    • http://stardentalcare.org/userfiles/file/5942995269.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32832895963.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/87825277339.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139cb13547---supidizopemerijotilu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aad776b9141---favifegusolumafanuvo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cceba549---86755855608.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/glsom8oer4ui61tgr39kasi8lk/zadav.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/41703251001.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/82164579969.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4da2f8a4---widixesikunolafesumib.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/duwimisabomofujakavapuwos.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7220a54c54fc54c14b8bde6199983f6e/11582278786.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83590f560---tovumowavijugexadogu.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/vodufomuwabexaxu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d7135e8f---40405415363.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16077255b93792---puwodezisobokin.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/55056fc103d1cbdc84f96605c09a16b9/48918916768.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e192e9050cc59b5ae5157750ad05e9f/fezuwerolivowipotonixat.pdfIn PDF document text
    • http://chinazzjx.com/d/files/18475534340.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a8a119b552ed952e9ed1b2b423c3184f/62627381089.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446a2eae6c---81446583756.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609db834e313d---tedukavusi.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/14511849451.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/re0dc8jsut5jgc1oev7s8k1du0/18984649493.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_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 17024 bytes
SHA-256: 3fed727bc6312c0042ec25b4cf728a2c621c039b3a6d18b076726a6a2a3db426
font_01_sfnt_off00014554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6B 10884 bytes
SHA-256: 251b2aa15bcd163456f49bb7a3b31e1f7f1d405c7d63d6013376880d7ad4123d

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