Malicious PDF — malware analysis report

Static analysis result for SHA-256 032a44a53258476b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 10:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d798bb04dcf17037d4ecdef8f3b38c1b SHA-1: a5148836cd0803e6a6f55f21642f815509b34eb6 SHA-256: 032a44a53258476b9781c457940e1a87885384be7b411282f3154a64c3bc5d02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://laborke.ru/uplcv?utm_term=how+to+install+thoptv+in+amazon+fire+stick PDF link annotation
    • https://sapporopools.com/contents/files/toxapinewadigonunewuva.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/36960490443.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gelakonugofapudorewobexi.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/67822365684.pdfIn PDF document text
    • https://shibbirs.com/media/files/xenatowameduz.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210906_160953.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336fde8d9f---79765258263.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/difowevomekunevemox.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/8992290483.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/tozunotupejok.pdfIn PDF document text
    • https://anfauglir.com/images/file/wuzagorem.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bovalagipeworofipota.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/66574780193.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/giwirurijasigizolonezew.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/dorisagidesuwufefulowu.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/28610286905.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemuzupolojarotenebituroj.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/32000471061.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/gezujazoli.pdfIn PDF document text
    • http://househouse.it/userfiles/files/xomuxudidome.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bd54d3b83ca5863293ee6b756597c536/64995136953.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/6718563290.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/42624314570.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/51937265082.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/velemel.pdfIn 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_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 18172 bytes
SHA-256: 584d2bb58ac1d555f1c048feddcf7954a0534b23a874dcdbd2f5e29bd32a0f7a
font_01_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 11040 bytes
SHA-256: e690e29ebb74ebe4850058eee0f5eb1cb3182e2b75a3860c46a9b29e3fa7b96f
font_02_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1