Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cb577a11d54b75…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 11:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bfc9897b8040eca879401b32b83e232 SHA-1: 65e35d30bae3abd913ad100df65526c90e4fdb5c SHA-256: 70cb577a11d54b7541d1faf94ed1e59edbc9d840deff4c7bb1148e0c49f6aff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure are designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=hog+cholera+pdf PDF link annotation
    • http://kaupa.cz/userfiles/file/89829782299.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kalud.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h743hda0scl5ps83978e7dkf26/39571552874.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/tofuvifexalilojov.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/20/file/20210620_055438_140.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751bb95b78---nobedosifobejofigudisezot.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/45696389669.pdfIn PDF document text
    • http://chongros.com/userData/board/file/nirexufalazilazalalesikop.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/36515409182.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/vofaw.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cfbd755895f3608c6c5724ab95d2f86e/16112083627.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/zokowenufomameveziretero.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/94c5e79420fcc87ee32d907495b0b197/dosugi.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/23534424645.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/dipebiwu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/49479023155.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e03e236a5d211f97fc1fa575bc918a15/12331807510.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/fupuzuvapuxu.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/28871519879.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/gb4oei2k7aamebgbqmviu7n8aa/jolugegosakexa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b7f243dc0---29393361163.pdfIn PDF document text
    • https://onlinendttraining.net/files/55142305.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1e340694d7b6c3592ff026cb6a5668e5/wiraxejuza.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/57154028983.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/g9ru26jk9hdji530nss5otg063/kodevimakolipupobelaposu.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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 10428 bytes
SHA-256: 54967d72a43afdebf8b6533c312d5827faad88509f98eccef4c5fe4c3975fb80
font_02_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 15624 bytes
SHA-256: d0437e09e00a0b1072efd53d5ccde9578a3cba580f71ebdb2702acd4a9aabcd9

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