Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dfd75e587d18e2…

MALICIOUS

PDF

86.4 KB Created: 2021-07-02 16:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46780b9a26091e72d27a0bcd175cea34 SHA-1: a2e8869dc9c659b2b0a0d5baa9357922ee1e4beb SHA-256: 37dfd75e587d18e2d0edcf8c6abf727427f7365cc5b649cdc498fd9be9d05731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document exhibits characteristics of an advance-fee scam, using lures related to lotteries, prizes, or parcel deliveries, and includes a callback lure for potential further social engineering. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate it is part of a link farm hosted on compromised CMS upload directories. No scripts were extracted, but the document structure and heuristics suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/brohvtb1a7ardapl19tmfsldp4/83302810620.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160894ddf202cf---18611962662.pdf
    • http://daoltrading.com/userData/board/file/4900421965.pdf
    • https://alamansyria.com/userfiles/file/fosuwitupefuzunuz.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ct1ibsr665583upg0q8jcp5ckf/13571748966.pdf
    • http://birnagarcollege.in/userfiles/file/fojibumot.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2677f61bf5---sufosapidamajovuv.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c47525ab274---88124437954.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/mcnmet6tiomkj71or72vkj1jn9/nanotisiveture.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83d4f274c---pimawezutevefo.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/tc9ia5r5fq6e5p4jmpc6oi7eem/zidowirugodebezuzutib.pdf
    • http://jrpst.pl/userfiles/file/setiguz.pdf
    • https://transmar.biz/ckfinder/userfiles/files/rapekosewese.pdf
    • http://bidwoodmachine.com/d/files/21268135250.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26772f002---tazigi.pdf
    • http://royalgroup.at/tmp/73102682145.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qu81iid9u5di60r1d5q4j492u4/fubus.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/944978cd4496002537b04c1ad36d4abb/92317583433.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/eebf66f09db83ff6342933727f71ab76/fokowepiguxibasuv.pdf
    • http://deepakbatteries.com/uploads/file/kufoso.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d1164d6f---lovof.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a4b5f849a51e74e80691aeb190062b71/16793868457.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=berks+county+register+of+wills+search
    • 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_off0000ecea.bin
42c9c6c267c3e0c6b360b6aac3bd52fe7ea3d9973aa97d27d9d7066c67735047
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 11060 bytes
font_01_sfnt_off000106c5.bin
9dd26cd36b8dcbf1a5f220315fea50f6028340f8c52393226a3843ae3d8d75c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 17276 bytes
font_02_sfnt_off0001343c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1343C 16792 bytes