Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb2ded621334744…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 21:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31ef7364dac939fbb5a466a1e0ea2440 SHA-1: 561bfcdcc22c61d0311435fc6306e80bff7beeee SHA-256: 9bb2ded62133474413c98c0af6dc3d43ebb9c14035d74b937386b5f6c187fc32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://inwebjor.ru/uplcv?utm_term=cast+of+santa+clause+1 PDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/790369b23a98d062044222a511c66f44/fatutojobusa.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/12781845260.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/47868675291.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/9oa4r538cdmnit445g09sa057n/mirujelorusogos.pdfIn PDF document text
    • https://starbox.fr/img/files/45608984959.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/r5eik9pcj93mlos0gt4mgib5m0/lujoraxopitexanom.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pinasuzab.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/35793293624.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/13689279004.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7caa9de9c0---bexavupakunebiwejefiguze.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cea5261cf20d096d6ba5d47106440a26/zalaf.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849648ca0e0---57352909040.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8b4b922a0185f26194fcde9962928747/xunelumufezimer.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/zevusi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e21dd441d---37612197504.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/af4035e1e5fd5c55e0d64a94816ea056/dopur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074101be080a---nukokosepasurupixuf.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/160752358917.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7be495b8db20c9039d596b8269727ef8/74181083815.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5bebb9a0---bugugilelox.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2e7971e2d013466e215f8816695b642b/fewexomuzawuwif.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/033253a5355fb6e1bf5f15173bdaf76f/pidukenivegaba.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pfknril90jmpu1l1ilan3tvqjb/31009425009.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/paxutulipejixikugalubi.pdfIn PDF document text
    • http://ausafe.net/images/art/files/99874054865.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_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 17492 bytes
SHA-256: 865810004731d83de5d70875863a53981daff06c3b9b5b6712bee5aaeab581f9
font_02_sfnt_off00014efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFD 10320 bytes
SHA-256: 6db8bddaa27afb422b97aecbaa9c93b9827f75ff0be75a26c2d9e1d4521063c2