Malicious PDF — malware analysis report

Static analysis result for SHA-256 c315edb6b1c3e8f2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 13:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55d8dd919c738284cbb07aa575bf603f SHA-1: 55d6d0e94e8b3151777ee45dd925f32359960b4b SHA-256: c315edb6b1c3e8f2bcee84c8dd0d113f3496a91f6b57ae70cb30f806f2de72f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'SE_QR_LURE' also suggests a potential QR code phishing attempt, though this is less certain without the QR code itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=android+phone+test+code PDF link annotation
    • http://serdceprirody.ru/userfiles/file/tetevizajefurosabe.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/12488868004.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/kakoxuda.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zekagodapepes.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/koajv7ko6doo53m4mv03pbrct3/kuxige.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382f133abee---mikaditefoxen.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/82946823866.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/84008704704.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/90229800413.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/reteregozanujuvuladelokoz.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/20316778167.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/jasavatu.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/28796727482.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/sewejotafesajawudopepemu.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/37520191092.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/76731625889.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/figududajebavisosek.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/saruvonasavavikirudawules.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fusezuxo.pdfIn PDF document text
    • http://taigesw.com/upload/files/fuvari.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/wigagoseve.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/11118266728.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210918_788EB721079C9867.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3939dbed---29231377611.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/79272707087.pdfIn PDF document text
    • 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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 17500 bytes
SHA-256: 94352c12cfe1c28dfaf6e25f3de12bf6d440e79c720e73b4114e90b6ef10fe8a
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 10384 bytes
SHA-256: 441b9600a55f9bbd54cc3e993d4a7bead22cb902345a9ebf268a31afc36542d6

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