Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cdb30b291b4446…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 22:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b279733d52dbb77603f3c43e24af1b92 SHA-1: cf0d41e166b256b1f9b1e3a1d9fdb45cd79f789f SHA-256: 54cdb30b291b44460c3e7c578ff3ff254f40a976c432c90bf8b8d65cf81acbe3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable domains. The document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7275dbc9b13dc1c65c2253dc9637f93/towiponulenigi.pdf In PDF document text
    • http://zimmerei-possert.at/xeziwoxabajabuzid.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/zalunigo.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/41512697548.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/zuvuvit.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gnqc2qlb3o2ku82htd4qn3gvo4/3073552791.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/suxegamo.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/vexaxukolumonu.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/64821426041.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9d95e40dbc7bf8d4bd45f23adadcad07/93240031329.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/pakudegajamisove.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/57f0d071259be90f863604fa610810fc/9212844581.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/ruvupagodozowavudure.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/ziritajadujixezakobebufi.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/jadokupikagenajabidu.pdfIn PDF document text
    • https://limmaginebistrot.com/file/6850583075.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a78528a3cf5---27272167035.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8417cf10e24250076f936fc29809ba89/tegebomozuxuvuramavos.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210727115628.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8baf069cdf---23784521149.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b339e46d0654ec7182d17e3e4f6cb276/13528917578.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1208f6f3---zofavotexezos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=environment+impact+assessment+report+pdfPDF 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_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 16544 bytes
SHA-256: d0d98ce5098ae81004027d412bbd0594e679dd02dc52929eb61f1706083235cd
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10784 bytes
SHA-256: 9d4a71283f5533591b377270a40da866557e29b9e6a663219ba3bf7c137941d8

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