Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fa144427f80228…

MALICIOUS

PDF

113.8 KB Created: 2021-06-29 10:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e1c1858d4be6b13dd0674c98c06fb3a9 SHA-1: 040a113516d6888114ff20cd2ccbca5112097972 SHA-256: 82fa144427f80228b392b86c465ed53bfcccae0a63e88029d919db2ae72443b3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b3f1cd15---20051195518.pdf In PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/jelomofenuna.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rrmn2no5pds8sa91f2qlat8t84/vosexugojufuxejepedi.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/bbbbb8c96139debe91a755aacb7482ff/xitamomebosebadopofi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/suzetexomowemarub.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5517acf539---dabometalobugeb.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tanokupurutuxis.pdfIn PDF document text
    • https://isosklo.cz/uploads/pazawosudisazevim.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c20dc3e2f2a---69544267532.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f5fd7857---18494783855.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/pcqjo1m5l2o4skfnua0rcl03nk/nimudumive.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d147385526---tinatokigekulawof.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/juxofosege.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f1f47f4a6f28593b9832b402740281bc/futonisubenozokufuvek.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689701a1f3---bevamupineterani.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/31016916903.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/83321743579.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa07377dbc6---77343088227.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/pomorevorujudukuzoxo.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/60300792725.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/2405246056.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace40b0e9a---48002847906.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f3c0717e---91390682833.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3242b83689---31139223831.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f41263cf---35089713583.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43dd9e50f---85750358134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=molting+in+crustaceansPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 19176 bytes
SHA-256: 13dac34692c9260363ecfa10f7a4a08b4a1753f1ecf0d6c8a15fdbc6c06fdb09
font_01_sfnt_off00017427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17427 10496 bytes
SHA-256: 9c24a371e97c15bc641ddc762d3da62fa424ae35bd7faf89586231fe93bd155f
font_02_sfnt_off00018c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A449 16080 bytes
SHA-256: d7a973a4804b306f127bb13ec069baef187aae2cf4a871f2ceb0179a4473d399