Malicious PDF — malware analysis report

Static analysis result for SHA-256 842a203052986a9c…

MALICIOUS

PDF

101.6 KB Created: 2021-08-04 14:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1689ff46ee6c78d8214148de37a95869 SHA-1: 2388f664d4c5a52590eba06af7609818bd94441d SHA-256: 842a203052986a9cc56f5e487e369b1b820f71779deab01bd566e494295405b5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=summary+of+half+of+a+yellow+sun+movie PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608269d915013---27773302711.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/1153372597.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dfe368fffb082100947600a02aace216/70410594859.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d915fc2cc8b---31489517179.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/35605568784.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec83eb814c---72436179204.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7q9r9luo4qbiat4epsmjg3bcai/63829060653.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/mitubalawoma.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/fudidu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1570216bd---34971808452.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/76b9618df0a07fce9d68b400a9b02b89/zinopenaw.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/77871277384.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/sasajuloxuzemedar.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/82910876555.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/38078222569.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f66d2adbc7---22199296390.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/lidulerabiluxusulatawi.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a24e93767---zijizonidulidusisexoxawe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/66ceec0bffd186622604c8ecff189570/34035645233.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/kagenezaxoziketojorapa.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d80ac7d4---latojukiwuvotuvemigi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a18cb13bc66---bateligemawobu.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/xidewizowizuj.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_off00012954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 17704 bytes
SHA-256: d66817df683cca2160b6d74d9017d9d4cea3579fd851a88126b26e3e94463fc2
font_01_sfnt_off00015748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15748 10824 bytes
SHA-256: 7eaad705a11012c170a835fa4374ef8c9d085b559bc0349dc90c42944552f8c1
font_02_sfnt_off00017017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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