Malicious PDF — malware analysis report

Static analysis result for SHA-256 871ae419f9afaa75…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 17:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f484e5b6c5aaff8fe3c3e8a5a59f62fa SHA-1: 52f2f973b6110b8017b46f0753a78e6b849fbbda SHA-256: 871ae419f9afaa752fd963cc467d4b8ffd416c78dec7c286cc8c8962c1cb5fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of external URI links and the overall structure suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lightofislamonair.org/uploads/files/22785583658.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fee5fdd372749db25aa65aa33ab88f9e/nizuxokodipaxa.pdf
    • http://adance0112.com/upfile/editor/file/76708384280.pdf
    • https://nic-irq.com/userfiles/files/46545385971.pdf
    • http://ecolservizinettuno.com/userfiles/files/88643118785.pdf
    • http://pensjonatagat.pl/userfiles/file/jukejituledaxupuvipe.pdf
    • https://5703n1n6999-6a55.com/contents/files/36160525897.pdf
    • http://cukorbetegshop.hu/files/65735218862.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ekmov7eh0mrop0bcaqhgod8nm9/nuvenanaxigelowesebe.pdf
    • https://saunadlaciebie.pl/userfiles/file/tizebu.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161487ad15f7c1---zurobafud.pdf
    • http://www.santamyoga.be/images/file/92826597598.pdf
    • https://globalathena.com/ckfinder/userfiles/files/gaxugaxebasiwifopoz.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/fupodobor.pdf
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/96608523496.pdf
    • http://recviem.ru/img/upload/redudasasagawaruxeje.pdf
    • http://falconltd.pl/cache/file/dodofonoxunux.pdf
    • https://greenline.bg/userfiles/file/kitefojesujovor.pdf
    • http://vinabomi.com/uploads/userfiles/file/65297091901.pdf
    • https://vadihosting.com/calisma2/files/uploads/29059844334.pdf
    • http://gilendor.cz/userfiles/file/kegufeluditenanur.pdf
    • http://www.ap-arte.ro/fckupload/file/90390958193.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146596632948---tipuwaf.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/kugivo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sports+head+volleyball+unblocked
    • 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_off0000b049.bin
6619d1b9e76058574d1924d4c75cec672c8fc91edab37ef77b29d3822d5466a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16636 bytes
font_01_sfnt_off0000da40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 16792 bytes
font_02_sfnt_off0000f257.bin
87fe4fdad9595186c492c1ca8da31b48fad8b25137234674f94f1d35eedb4928
pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 11108 bytes