Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c330a12b4350ab…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 05:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb2cbc163bc5cafbfe93d8ff30d36e94 SHA-1: f266934db1dc573fca4451076e92c461aefd19df SHA-256: d4c330a12b4350abf60584c930a19cb2acae7944ff0f488eeb4ad8cafa11eaa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://newdesert.pl/userfiles/file/76541927788.pdf In PDF document text
    • http://improntediteatro.it/userfiles/files/54359402549.pdfIn PDF document text
    • https://kham.vn/userfiles/file/2376836933.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/mabikuvixisaguf.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/51475453386.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/51914998835.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/vuwazedo.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ng6kf51tlqq381sgelsmseggel/pomimifapevobolojen.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/vewanumifijesamumelupo.pdfIn PDF document text
    • http://gibisch.org/files/files/wukazaxotekuge.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb3c92198---27802139843.pdfIn PDF document text
    • https://grouptm2.com/contents/files/wenerozuwit.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/99315185074.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109071350393760.pdfIn PDF document text
    • http://symbolfoods.com/files/file///zomeligeridotig.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/89860236093.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a2f1dd6495e83ccd103b331731be333e/72722826753.pdfIn PDF document text
    • http://dges.in/userfiles/file/32983420945.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/41797375348.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f316067a---29358366500.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/nubetaxizege.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/wuvogiz.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/55278514905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mobile+price+in+bd+under+20000PDF 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_off0000b932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 16236 bytes
SHA-256: 23dc1bb48e8cd2a8427df5b071469fa8eeb12d09639a6d60f7460932cb61d088
font_02_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10556 bytes
SHA-256: a88b73dc73e8ed90341afc197ea344e319a355431357646d524e4fd8c95ff4f8