Malicious PDF — malware analysis report

Static analysis result for SHA-256 638e12bc4d5e2111…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 13:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8a0b5c4e50de150ff51f4aaa6f338e2c SHA-1: 0dfa22c7c5489f47e1a622a0d734b20d930b9204 SHA-256: 638e12bc4d5e2111e2e91ff0660febedde0b5a7c3fc6b65e749021358b4d6fb7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ficfart.org/userfiles/file/69227796405.pdf In PDF document text
    • http://yuemeism.com/uploadfiles/files/89971990550.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/19623963624.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/12096249903.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/17326202915.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/39415926489.pdfIn PDF document text
    • http://airmon.hu/images/files/sixevopigadivaxis.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/noguwosexuzewarebajawumam.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/25714407403.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/pitejewiwuvoxax.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/sawapalijanoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f4f53cf4---pukopava.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/m690v75sc9qeah436a228vvqm3/24451926243.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/78113326013.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/90517747535.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613931ef05881---57880624389.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/7606049395.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5be38dfa982ed291b7c0fb2b0dc14ea1/24013769809.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/pigubodejelerinonudimobak.pdfIn PDF document text
    • http://uco-kampen.com/media/files/85225330187.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/76140573062.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/suxebozodemojegikopod.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/vipanugotel.pdfIn PDF document text
    • https://ptogel1.com/contents/files/14706510673.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/fisemurifokokodujisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+free+file+manager+for+androidPDF 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_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 17356 bytes
SHA-256: 38d36895bd9347deac1a4a6408f51a42ec9b2a9dc166a795fba429b72cacee43
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 10752 bytes
SHA-256: fc5b1670f5240e8bf67360d8a4bdd59ff437828b9a836201a2526ae3c6376a63

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