Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7709e1de8f73946…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 22:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e57397cc74c31f6afbf48ef9da314759 SHA-1: 546c7f07e789d3a94e9a2171e7bcbe984e5bf88b SHA-256: e7709e1de8f73946ef7f576a78b99e59a40d3c5a286c630f9cbd163fe586042e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=plant+vs+zombie+free+apk PDF link annotation
    • https://dakhoathienhoa.net/images/files/15879869765.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/88937064151.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/panodowopurezajapanubutof.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac76c1960c---68865819979.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/43373940912.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109080932489696.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/47629685544.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/64179193624.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/11448609522.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bufeki.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ab063d42154991ea7e0f573a4656df73/22180794838.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/wuvosumezoxakakoxala.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/3779853161371bedee2bd.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/ripunikofujusefafufikidur.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/jubuzexivugokon.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/vakatez.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/38679912285.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906022247.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/48a19f4e25795292fe4c62b935147e29/doliwaminuvinedugufolaza.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/lurupur.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/ginusepus.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/bisugez.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_off0000c4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EA 19996 bytes
SHA-256: 7a1bacfde04d92805063bfccee89e2e69f6388b49ef3c4e693e31d5ed66e15c5
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 10876 bytes
SHA-256: 0b86abc104877db60ad5e844bf9ad8d8e0284b7412277ffc7328b2211526dd6a
font_02_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1