Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b82048f440fd669…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 09:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc557d27f34230551468b9fe0736f117 SHA-1: c3c0290e8f39b39809c96a11a73c0d93b2f9e72e SHA-256: 1b82048f440fd669e35c131781d85c6ce9c7a44acf719644e6137d399f7b3eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pistant.ru/uplcv?utm_term=how+to+stream+live+sports+on+firestick
    • http://hydrem.ru/images/file/88206219542.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/lesidegijapifo.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/70550a01b404060085ea5fe234875847/gifopulimomimiwamutis.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/03096596e5291a0582c3b5b4a3c14532/56962022093.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd3f9499a---88801906577.pdf
    • http://a2hgghk.handylover.com/upload/files/52243069741.pdf
    • http://bienbao.net/uploads/files/vesukadobibupitaga.pdf
    • http://eskuvotoszkanaban.hu/editor_up/fulexigubazewewadelix.pdf
    • https://3drm.bg/uploads/pictures/files/58977942297.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/13446187039.pdf
    • http://soupworld.de/upload/file/guzixafixiwixifo.pdf
    • http://northmarking.com/userfiles/files/82956580455.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vefupivavaviposabu.pdf
    • http://qianshunqs.com/admin/upload/zajubopab.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/lagapikak.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5fc98a3aa5d7a5a10851433679b417a4/nenemupufu.pdf
    • https://beyondpins.com/calisma2/files/uploads/farixefuwiriselep.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/422abcde4232a79f5ce0560896ca1283/86527015121.pdf
    • http://stomerijindex.nl/images/uploads/86634033965.pdf
    • http://studiomanzella.com/userfiles/files/vikaposejafodefodug.pdf
    • https://kratky.eu/files/file/fuwigivejegoselidubo.pdf
    • https://pui-vital.ro/msg_media/file/jozujafi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4e.bin
885291bcd35d1ad5674cbca9b557f93c1d8053789f7efe6797420e3a9d136b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 10876 bytes
font_01_sfnt_off0000f375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
font_02_sfnt_off00010b87.bin
734361ea7aaf4ac7dfac2abe52f93c44612db0631c0431a54afb7a04bd690a45
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 17476 bytes