Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f2f91f5a605f14…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 15:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b164512650f4d99955deda6da0d29943 SHA-1: 1d42b81d220b2c7455724571fde9593ba10617ec SHA-256: a9f2f91f5a605f148b2def402c7efa2b9b604e94dd1a3c6a771ed0449b539064
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=how+many+zeros+are+in+1+quadrillion PDF link annotation
    • http://closehorses.com/userfiles/file/pikinadomodor.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/54388265292.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/tagexekodewodawideliruw.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/fujuj.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/4782081490.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb030babf---dawexafudijitilu.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/99453786314.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/99125863560.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/41234989495.pdfIn PDF document text
    • http://cecev.com/stockages/files/41712648757.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/32220090530.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/wasaxaleli.pdfIn PDF document text
    • http://ranchobg.com/img/file/5350974770.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cdbkmt1404vr5npaa1p2remipi/95461491716.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/rakuxu.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xiruxepogekisaxipixituv.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/74637996019.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/49555219104.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/lusolirumupivujuzigivow.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8470917---tarusobel.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/rajufebifi.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/dozilarenakamuwipuxef.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqcl8gq9p9rftolic3bn7gk6s5/lumezeloz.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/lekipemafozomugepelopapo.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913131406.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/julofu.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/lidoboxuripuzoposozemoje.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_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 10860 bytes
SHA-256: de61cbafa85a0115619d923b946341b301cbb308a56f3152a346e3227062c474
font_02_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 15544 bytes
SHA-256: 2d290e6d8438e1d6d45d23a703a46325c288dbb3c53fb874706d70eac1b939b5

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