Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7126ab4a5fc59a1…

MALICIOUS

PDF

158.7 KB Created: 2021-06-28 05:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dad7c1bf1181aaec511612d2e5bde17 SHA-1: 830e47432539e2e903750ff54974afa8df6ec30c SHA-256: e7126ab4a5fc59a1c7c20f1ab064bb0c9670b4261cac6ca4c03f0ce63543a740
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads, suggesting it functions as a link farm. The ML classifier strongly indicates maliciousness, and the presence of external URIs and link farms points towards a phishing or malware distribution attempt. No scripts were extracted, but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=well+labelled+diagram+of+a+plant+cell
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/02f4f39325976495c7fc1616615b8944/90985087308.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523ed4638f---pikukaz.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc80de6f6---98821881417.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/87168865175.pdf
    • http://travelshops.pl/userfiles/file/sufanoset.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d504540912e---19027920460.pdf
    • http://bike-aholic.com/UserFiles/file/xajubetobeditetovav.pdf
    • http://www.aadhar-interior.com/userfiles/file/mimelobol.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/14194999041.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8dda37785b425ca62721a90bc1eb1969/46284701322.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b7d8d0362d8f98ba07b1d521e0bf4ccb/86705595445.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c887c21ce04---lafet.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/37982440179.pdf
    • https://imagebeaute.fr/userfiles/file/38558998781.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/79b681e2297a9ffad32d31b004e779ed/12627877927.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb249ada48---tosuxapaw.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/misarifibirofa.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/53ec079bfcbd5337c79891a054d1fc08/4232574935.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160972a20963ab---26746513222.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mkb5nk756j33jsa2nrhiblmmo2/30462621158.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ktrct3q1bliojuceh0jvaqv6r8/6277034884.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6e6dd379---53600942616.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ndlvegoneoqfrmr5o1mjqasip4/6516255852.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020bad.bin
76b95b498131b18628e867efeb81c135cd8bf01f6dab11d0b641110e9b112a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x20BAD 10928 bytes
font_01_sfnt_off00022480.bin
f969624e0bbeb607013aa048dad9916bc98ced42fa5eecd5876238173d39fa44
pdf-font-stream PDF embedded font (sfnt) at offset 0x22480 18724 bytes
font_02_sfnt_off00025504.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25504 16792 bytes