Malicious PDF — malware analysis report

Static analysis result for SHA-256 8750247b81e14596…

MALICIOUS

PDF

95.1 KB Created: 2021-07-26 11:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57a359bc5f4619ef84150f62146709cd SHA-1: 7c761ba76550be09da824c9b601a74e6470417d4 SHA-256: 8750247b81e14596d77e7474596bf6c4d043dc49f130003e43d2e9274ff252c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://mmckno2010.zkosuchdol.info/files/32583157993.pdf In PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/pudajir.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/74377964857.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ca231b45---xefabopetejiropupozidi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/66658154871.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/72024515901.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3dcd9ddf---84495096669.pdfIn PDF document text
    • http://etre-belle.su/images/file/29335996363.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pakuludikelosaxanem.pdfIn PDF document text
    • https://digireg.ch/upload/52754611555.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/0vjc8i46anad305sa7obnf028o/48862538283.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/15606960921.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/284ee8b0e57363c535ffce9c67ba4e56/91379865915.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/skd3qbtum54mubblrkfhol7bk4/bopotujijotavuw.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2c2c676d8c6cafbe0838305ff37460b5/33964408690.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/69668647638.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/52b12d4ec56dcc51f785d6acab6b3f2f/vazubufiwatu.pdfIn PDF document text
    • https://kawanmto.org/contents//files/vomesibenaburabaletim.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160865711e549c---81647212998.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/zomuzova.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/76707913187.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/jetojajidapusavisufijom.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/pifefikeluf.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0a98ea3e6bfeef41e5d1a6c9ac9f9756/83688570112.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d6f9ff8e6c12c9f041d936e16c537323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=substrate+controlled+stereoselective+reactionPDF link annotation
    • 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_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 17864 bytes
SHA-256: 5d699539cc396ada58224d403f3437300aca5ae1b45ee501d2003df7d159e898
font_01_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 10744 bytes
SHA-256: 40587be020f74d3936c4cac8827ea1ded453555381815b9cc27865f343cfd12b
font_02_sfnt_off0001544f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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