Malicious PDF — malware analysis report

Static analysis result for SHA-256 750930077ede4a01…

MALICIOUS

PDF

82.8 KB Created: 2021-06-26 20:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c131ebe468e1e0a3854ddfdaa764b4c9 SHA-1: 8b19e2e9962e310170e19a5a49f2b242f4326848 SHA-256: 750930077ede4a019a062fc48b88bc23be238d8f496f0191af40618c61f9bd9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=how+many+pounds+is+one+cubic+foot+of+soil
    • https://trunglamdecor.com/uploads/userfiles/file/61496436796.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2f0d7046c---88155486563.pdf
    • https://ludifrance.fr/userfiles/file/notidokotolu.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e3ac53407380b6be5bb3fadd59f6496d/tukugejixi.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e504f48e---giladexalitebidaragu.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/603fcbd836a72bbd6b19fd168f7be628/92236462338.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609072cecccfb---95185091302.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095b309347fe---wutakemelaliz.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e450bd316---bizuzif.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/likularuzam.pdf
    • http://matraholding.hu/images/userfiles/files/92678335526.pdf
    • https://steklo-shik.ru/userfiles/file/jebuv.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abac842a7---jilasewopiz.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d410ddf504---rigepinilugomu.pdf
    • http://dansensvenner.dk/imagesfile///lafepisafavijag.pdf
    • https://manuscripthandler.com/userfiles/file/77863452044.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h9h5rlpfjvnq4a2ovkdvlp9fvi/6590192962.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608401686a414---migebaziboxesuximosiw.pdf
    • https://thefertilizerequipment.com/d/files/43360340119.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r8af0c22442c2998u9ik4s86k2/nogufuzojuzereke.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f0bdaf11fb208cce0fab76e56ec2fa00/2881317788.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7c7e33a5---74278065332.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dd0a42178---89524023754.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2c1913d5---titadejegazalavugu.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/eda452ed320ef1df5b807963751d6fd4/fodosez.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d96b17df7---94971796776.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_off0000dd60.bin
5f1d001811a24a059abdf11588e8b4ce39127f48212c21670b4493b0c2611dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 11112 bytes
font_01_sfnt_off0000f71c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 16792 bytes
font_02_sfnt_off00010f2e.bin
d6e6bb6f63f86ebad3a5d875c5bd80b9715e6ac72ead5feeb68e117d80156415
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 17516 bytes