Malicious PDF — malware analysis report

Static analysis result for SHA-256 9028ac5d47ab5bf2…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 22:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84bed062b993bb53757acbbda6a7f8ed SHA-1: 4db2cbcb45b137c7ae045b16c22a21b6dd108ab5 SHA-256: 9028ac5d47ab5bf240661f34c7892cb53c9bbe002d824f8e738546574d41cb1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs hosted on compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The PDF structure itself does not contain readable content, but the presence of these links strongly implies a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fc1c85d---waxelokali.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8198331e---sujajinawiwizabit.pdf
    • https://bbgpiti.com/userfiles/files/pikukigefenizuwo.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3e00fb31eeeb5fd174f581096ae8933b/94064644168.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076868793dff---34035874235.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/patinipigozobededajibuk.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745be6ced9---43924256175.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/aa2ecd095fd8829b05211373035c4486/7760985004.pdf
    • https://geneticapanama.com/userfiles/file/liwelojejajobil.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c2251419---tuwewudalik.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3h40pr9r0b3g98h9ci1craqeo7/73244004792.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mn3nh4o8lh2of9nv7hf7phdboc/97437269798.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/370ef09614456a3c0237960e2ace0d0d/lelegexomimaxozumajejepa.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/37617913379.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6d73a933f6dc7d3b6ef24625fd7b4c3c/jesujerupobariwibi.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2dccc8cca---bepoza.pdf
    • https://digireg.li/upload/33977877864.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcdbbc0837---2592499500.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b9ef2076219443ceb49c2d5a5030e904/9130549373.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f04c5d784---jilududitagiwob.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f95f812b0---17565645008.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lpkchhjtkf0k8ng21uiusc95r4/91519597557.pdf
    • http://amadpich.com/userfiles/file/40819538779.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=design+thinking+for+the+greater+good+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_off0000f417.bin
492350a1f394a03c36a79c352b9c22aeefac70c3abb7d392df371c7ca800bda2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 16708 bytes
font_01_sfnt_off00011fac.bin
e48996be212e3f6d542f58298676a02d5bd9722a2113ded9edfbf8da7b2d3c41
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 10824 bytes
font_02_sfnt_off00013866.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 16792 bytes