Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacf1f9df846d50c…

MALICIOUS

PDF

81.7 KB Created: 2021-07-20 06:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d005f1af7934c4162b1a848fcbe8fbe5 SHA-1: 5344f87c7242b63f43e29b2065b2cffa48455887 SHA-256: eacf1f9df846d50cd6c2f7fb18fa8ad91e9436d15de284fe0b4c14851b51d24a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0205bbe8---lozadiwizoxatuzolakemusi.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1283c1f02---farikazigidukosodejep.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/jirojebeganitefebevil.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/14662679184.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/tazometanefinuz.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/laburumoremo.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///34057414229.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/92593325264.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kixivimiwi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/4bc1ao7pvjocp8jltcjtickhhn/56456986399.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cdeb3368ebb---xedemeguwurisefuxi.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/gai988pudgeqa4nkdot3u4ol77/42057162094.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/79611778540.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/wonupepapavugofiwuzanun.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df50e7af80---75035012001.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/xazenidagiwizovibof.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wemudopimolekobojojatur.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/250cce0c0d5d6784849e1e2bd8d8c11b/31006291185.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bea1a1a72---59450948779.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/fosawo.pdfIn PDF document text
    • http://nfc.soo.jp/file/fejofaxiwavojogiluna.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/38073779388.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/71cc7d01d1c13ee33a580e6f0419a160/gumatet.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace4f6efdf---6108721383.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xepivure.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63fbaa2e9d---vizisejezofozuzenagofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sporotrichosis+clinical+featuresPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 16744 bytes
SHA-256: 6d3192fa1fad433af024f1451173e03394c3038433892babef77f2d5d7a15a6c
font_02_sfnt_off000120d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D7 10752 bytes
SHA-256: c102d329b07bceb9405a1b6c2ba9b3181b66183fcd7572856055638ba00fc608

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