Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0637725cef6d86…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 12:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5fa251f0f0438ac9e437519d9daec3a SHA-1: c2dc629dd41a2c412e8bae6a85d8a5f5b5375c90 SHA-256: fc0637725cef6d86213e60d4ead0b46bf20685e5ba89d8a5f49005c259ecc1a1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains embedded JavaScript, which is likely used to download and execute a second-stage payload from one of the numerous external URLs. The presence of a fake invoice lure further supports the phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c0359c485---19889061387.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/91178305228.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4279deabccf6e4c3fdffaace47af64cf/82032159977.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d137f5b0af6ab5495edd1984aa313eda/91896016317.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e4d5a22c---89861646638.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a88495eab7a---ronivitejudi.pdf
    • http://macabrey-luthier.fr/data/Files/merisozubilazazumezaxanob.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f7da3f5b---33880002332.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95422cf35f---genotuvibokajixokaj.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adf018d33b5---lusasomipuzibeloki.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/486f7cdccdc18c84e111dfea00e3c629/74336523341.pdf
    • https://securitydm.com/slicice/file/kufemubutafanuva.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802d844fac---92178534273.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/ruzofixezosazilosa.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c451537e---jisomatokozovikase.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/13e35104454692bccaf8fbfa9c3632b9/90364471513.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/tofaxonuvaga.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/87020d5df49c4bfee170106c0c6f3d88/dofejixuzatodusote.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cee5ad5c50d---29426432262.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d7b35a33---kebuwigar.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/847911b8ed3f2d7a21faed242c33026b/49212702435.pdf
    • http://stoewebdesign.no/userfiles/file/mimuset.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ab9d46a00a876a66f879ad9f4e8c6310/dujifipeluduwusobuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=1+m3+natural+gas+to+kwh
    • 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_off0000f79f.bin
41d9461941e4857fdb09c5c3db44dba0dcf794add72955b3883647ab74687122
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 10736 bytes
font_01_sfnt_off00011034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes
font_02_sfnt_off00012846.bin
d9afd65710c0d3b79af264a1582b402f704ecbcb2f5cd97c0d14ff55ddcfbb69
pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 17992 bytes