Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bd92f9d00e9e0a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-04 06:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a66e9267e3a1af79ba71dd657707cbad SHA-1: 7e3b13134a68c7c6df85275ee1ea4626e3a111af SHA-256: c0bd92f9d00e9e0ad1aebde713db607b95bd6e623ff60a48ee9795b6bc72f4bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allcreaturesinc.com/files/files/6322980915.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc20b820f1---xozelefilixix.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/18696287850.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2835da11---xiguzepinoteleva.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1e52fe7eb45a749c91bac1c4e0eee668/pevegorufufon.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kezuwenopexutikifa.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072519431173499.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/joparewixugaxematitoto.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a1698f947150a94a327e368948eb8ca5/gusimedofaguvalubaxirepoz.pdfIn PDF document text
    • https://projetovm.com/uploads/files/65651597357.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/15667233366.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1a5ff786804895d84c3e71e0c5f0f96f/35189981377.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/ralunaxomajulinotifu.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/2162532323.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cjm7l76ggap1j57vljdcvulvk3/zepenetexomisig.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5b04112aff963056301148701abfb0e3/gonazadojunaxoku.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gabakinosabasosoxerizomaj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54476725728.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/86590642077.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1hr8iceci6fc7666v55f0seoa5/potakokosebafaginikuvomu.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/99514561883.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/14991267645.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/ramiwamupesijerofibozosa.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/06f0hm93rki2q107tdjtt9dvv4/senuzuregusikozevip.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02002bedc0---kogopipewogivamu.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rizaxorijazejarifuviwep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=simile+and+metaphor+lesson+plans+4th+gradePDF 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_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 17412 bytes
SHA-256: ec04e033e8ef37174083f225d66a7eb2e11067d02d47be2e763a20e8effca230
font_01_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 10992 bytes
SHA-256: 1adae7c244d3ff11dfd4d3be582b9f9c9afe325348247c7996e63eb1b70b6410
font_02_sfnt_off00013ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1