Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe7ac18bc354156…

MALICIOUS

PDF

96.1 KB Created: 2021-10-05 22:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f9fa77330cf460a41c2d1c1b950dd33 SHA-1: f1c10d32346aad9ee78eaac192b68275e53d0581 SHA-256: 3fe7ac18bc3541567762196c502586ddc89efcc81e5c7510aa5dcad5f553def2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://openendrep.com/userfiles/files/54161619334.pdf In PDF document text
    • https://innotek.vn/uploads/news_file/wisaxipewadodiv.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20211003190536.pdfIn PDF document text
    • http://rooptex.com/uploads/87317661715.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/73876445195.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/nikutatadagulivul.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/mifesewuxigizizesi.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/gobodikupaxajitenomibapa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161581a9b8bdb3---logamodolubijike.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/846948f42ea66bddf016eb557e56551b/kizoge.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/lutojowoguroxijonix.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tlujtf3nosijtpdo6bo1basefq/95107909142.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/pozosodagoxoxodiboki.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/fedolidezegagu.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/87907729911.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/8773330483.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/9444047061.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/92675757222.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2c605fc70c9eac9188432d5ca32a1510/dawalitukanomeruxebemi.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/14515390741.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/93994752922.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/xunowofogejumadilajeluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=arkansas+tags+and+registrationPDF 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_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 10452 bytes
SHA-256: 796ad3f33f69a41a62090b73aeabbc1a16c95bb7fe18e7dbe2255cdaf36942ab
font_01_sfnt_off000124b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B8 20544 bytes
SHA-256: 0c9b6f6fda6fa15bcf2a2f4d1cd57d7ed7ecf5bbe209db581613df58dc6bd079
font_02_sfnt_off00015aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1