Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4e2c0136b95819…

MALICIOUS

PDF

147.1 KB Created: 2021-08-04 19:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63e341f229e23ed6ed9534c130f64f6a SHA-1: 7344bbbffcf98e73974ed7ef11b1a3cdb56bff37 SHA-256: ae4e2c0136b95819f3b0bbea12acffab7e2169e44a44683f695a3f029d3da45c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://steakclubhn.com/campannas/file/32054649183.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26814ccff---56249046204.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c056f27d5e7---demuloripebe.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162645450850691826941.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/makamisa.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/42350993559.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/63815272682.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/68967651661.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c762af2e8b---43574833669.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f52e0584c---ramugoxanase.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/3loadtm42evdi4phqcv85t7t4o/93608747535.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/lufaxovitixogulimidobol.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cf9e8ecfb36c577bb93bfc35d82b2907/33088255397.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///69422000490.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/52101162817.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/15268329591.pdfIn PDF document text
    • http://lagrupacio.cat/file/tijogiwolumopaka.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/20163e9ddb52e96d2ec42e7f4cb7fee3/5575329129.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7757af545c437f6f580f433eddeb088a/waxotapitabaloniwixom.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/wefinumogesodil.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kevagivekaxavujudi.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021715231554875.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/retizowasu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/vonif.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/fafccb859ae75b1fcee3d8ef31561de3/gegidinufadeligonofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+a+pro+bono+lawyer+ukPDF 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://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_off0001d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F079 18864 bytes
SHA-256: 7a7acb1d8d7f4001c17e0746e7d3728a2b034ce299c86548dbe491cea81f3c78
font_02_sfnt_off00022151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22151 10688 bytes
SHA-256: c9cf91d268e9a69540350f4ef598435a053bbc1e2f3aa743ad5563225b35913d
font_03_sfnt_off000239c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239C0 1956 bytes
SHA-256: 10c734ed2edf3a0ac070bb11ab362f81c95816e968aaa8bd1095f6d2658b0c35

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