Malicious PDF — malware analysis report

Static analysis result for SHA-256 038413a9a0a43636…

MALICIOUS

PDF

109.7 KB Created: 2021-06-27 08:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13eb70ec13121955c148fd7e67b019e2 SHA-1: 233a1ef542916c97f28409e06cda88874e62bec1 SHA-256: 038413a9a0a4363603724f20da58a210f7d60661c42d741de14ff86a1e23c891
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, likely serving as a lure for users to download further malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6b8f9c666---67056886283.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d17cbff3---fodezavibi.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa971c9a7c---78912219899.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9858fe754476c79bacfa9c6ad13ca875/79043545912.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec1183d54---63546337720.pdf
    • http://stasta.com/userfiles/file/mamisab.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6ee0a6e42---tojonurutasunexixadal.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f9347576db175e40705683efbc2f382a/setulowalazuxafa.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/02biq6ro09rbuacl9vt9r55l4b/76677924740.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865d10933c2---66998101754.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc09e4a1261---raruve.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fr1odmmob1vucf9tdj0kbbn59t/19653759727.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d928cddb425df2f1fbb11811b3ce1476/mawofafabixut.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c5550027e95---37475744254.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9d26d5b3c25668a29fbfac2232814b55/xanasanewexumodajavat.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa25dd9f8---86710823494.pdf
    • http://steakclubhn.com/campannas/file/fomiguxopalaluf.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tkbrd205vs332k7608pp1odjn6/103773435.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ce2c242d---23086468903.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdce13c6fbd---zokupasufikazijoxe.pdf
    • http://www.hangmandigital.com/files/file/zawad.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/h09oofnqr87res1q64a5avlkmg/fasobazij.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/40a52d7cf4a01bd8b9cdd7756f6a3178/reronidusaru.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99c77987d3---75649508909.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=tupac+kid+pictures
    • 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_off00014bac.bin
6d4a6f4176277bbec17e393e970ae91b11b8a3dd101b35cbb2ad7c2d81c01b30
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 17044 bytes
font_01_sfnt_off00017862.bin
a076717d5570a3f863a219225febfe89a86855b0360b387cd33231eacded8120
pdf-font-stream PDF embedded font (sfnt) at offset 0x17862 10392 bytes
font_02_sfnt_off00019016.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19016 16792 bytes