Malicious PDF — malware analysis report

Static analysis result for SHA-256 631f6138a25b55f2…

MALICIOUS

PDF

85.0 KB Created: 2021-06-29 10:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 319500c5d75a631a99a953c9fd21da4f SHA-1: a14cdae1d7d82202de42a8798ca45e65f9720214 SHA-256: 631f6138a25b55f2abf26953e9f68bf8f7b4c920fac0e7852d36204074be8b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfedaa29ec---14278947077.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bda5400bd---kujirebunog.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/rosojokuref.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b018986fe---65100428075.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1642b573---nigupaxabuveziruz.pdf
    • http://www.tekkoo.net/images/library/File/zolimubedaki.pdf
    • https://decoveinvestment.com/userfiles/file/jarizogufagaxefikos.pdf
    • http://abwpetersburg.com/uploads/files/razike.pdf
    • http://huile-de-nigelle.info/userfiles/file/wofiros.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070362f3fbee---16137843949.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4246e616cad07a3c039136ff11da21c0/tikudupubowozuxi.pdf
    • http://nineslash.com/user_file/file/dupozanufasujatafaz.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1933b2f505---37384072463.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210626011519.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/mikimufarituxaruwefewe.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d102906c---95770038270.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330ceccf83---491205422.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abda3e7d13e---3018734833.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b999f6bcdb4---53692929300.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b592108cfa0---39718737885.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608802c01d978---kugosoxitifem.pdf
    • http://boissee.fr/userfiles/file/35353970448.pdf
    • https://advik.net/userfiles/file/fasuginer.pdf
    • https://audit-advisers.com/userfiles/file/vurakiwojasufasapakazofat.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/3b7b13a6adee563c8406a2523bc25e6f/12201309197.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+man+with+the+compound+eyes+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_off0000e931.bin
2ee6ee5e03f0e3e92036e3f0b666ad37b968f67d4492c55c2c705beeac8dd1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 16808 bytes
font_01_sfnt_off000114f7.bin
a763f49a034bbe412aedf6b58254848c86824cee0628c849bc83c450731c6654
pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 11000 bytes
font_02_sfnt_off00012e75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 16792 bytes