Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c18e88dbd5317b…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 05:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72246c9b66895d29d97b8328e3b2a6aa SHA-1: 07c39490abe4972c05ac0db0be677150bb3e395a SHA-256: 06c18e88dbd5317b67d23d32ba5064d6a1a60eb5584002642c37f48d8c158590
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The presence of compromised CMS upload links suggests an attempt to host or distribute further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bkdesign.ee/userfiles/file/7609236977.pdf
    • http://web68s.com/upload/files/junimujapasodozopuk.pdf
    • http://robalton.es/Albums/images/file///65645522885.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c959a982cd7b5cea32d4e67781372a14/84695934031.pdf
    • http://kubak-ubezpieczenia.pl/userfiles/file/5769887697.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abe785861bb---87704268707.pdf
    • http://4reality.cz/userfiles/files/dugitafafefoz.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/70707662024.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b150139db---vapuxifuxiloxetav.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe892d893---98631251450.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210620_EEE3913EEB41300F.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/ketizedebir.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a0d446d46e7491def7e51f3eeb6366b2/datukejunug.pdf
    • https://caffedisanto.it/file/reralivapiparoreburubelu.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1e320mv2hra31koste69sqie6p/bojitudesak.pdf
    • http://www.ecvbrass.ch/user/web/file/musurivurivakorevekuni.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579851de05---3397896598.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/23453tigutdbe72v4hov2edvhf/wulezerurenurugozamogekof.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/39etluqts01oa47c7i6vd3fp06/bowukovoxuniximomap.pdf
    • https://appfacile.it/file/zedigosemopezogilo.pdf
    • http://zlato-invest.cz/upload/files/77030214926.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/032214ee4a1865e77b68bb4299c82a19/tejifevuxojovezuwasow.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab61dcb406---52127407280.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/12d386c6e831c5e156473f16bbfaa236/22786041681.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b62580a9a6838148c5cf973a2e17f73e/70270651835.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+word+fillable+form
    • 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_off0000f133.bin
d8cb9f5e426d8cc79f5760182fa6d2d5b125001f763ab74137f288acf4c0beef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 10552 bytes
font_01_sfnt_off0001093c.bin
561d2a8ba410f3eeea91af145576d3f213869c418831e602c3cf3a26194d0b12
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 16892 bytes
font_02_sfnt_off0001350b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 16792 bytes