Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a6a696f03af9f7…

MALICIOUS

PDF

85.0 KB Created: 2021-07-16 04:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fac1b05323a88113e813191007ddae88 SHA-1: c288e95be58284e1416a6176e56e5539ec150c4f SHA-256: 84a6a696f03af9f771ef9abfe897e5cecef2f38253f7c2bf34c7f0590d673919
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hum-lucknow.org/test/fckeditor/file/bebot.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39c5d292925bfd4816c879579782a625/tovaponefukepirudedagolub.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/tawusipesomi.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0a102434---71347744211.pdf
    • https://weddingitaly.jp/images/file/46290278225.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2430a56f---67368963157.pdf
    • https://planet-pvc.com/upload/files/rubujurenemoj.pdf
    • https://etonbio.com/newsLetters/images/file/wufamafepiguxoladeruf.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cefccbc019daa0edb26a2d0bd3f70dd6/xefafesazosopowuxinimile.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c838192b0ae5980898715cda34d0328a/7804752346.pdf
    • http://thuexedanang247.com/uploads/image/files/fufurusogoxorax.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2b6df5d---bigutoxanopu.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/162a2401ebbfb5ecc8417a4b58bdd807/vonegawejidu.pdf
    • http://kingtonkatsu.com/uploads/files/nasamowepavewunibesurax.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/dtocnpidaqs5tf2heqt09icivg/65351875174.pdf
    • http://toyteepee.com/uploadfiles/file/210620225229001332l50wcl.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/30052dddae461faf35ef79efa33f43d7/nopejoti.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ee1c0432a1e2497fed23f4c99c773b7a/80059146134.pdf
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/tivupipuzubixomenu.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/japovubojabafasovor.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/cd0533n8asmdqek8i79lv4jh6p/65332862261.pdf
    • https://dolcezzecaffe.it/file/45803569790.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac658645d---78001929500.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=license+disc+renewal+cost+2020
    • 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_off0000e9c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 16792 bytes
font_01_sfnt_off000101d3.bin
bb2b6d9687aa95edff1a71a988f519d3a69dbd27e2c848f825aaef3c10d40422
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 17120 bytes
font_02_sfnt_off00012e82.bin
c5ed229a0485174a0ff20413598d4542dd25477e22aac6242a3ea40916419a32
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 10648 bytes