Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab92e366269ff6e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 01:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a1e2e22352f781a641c21804cfac3c0 SHA-1: 0e8dd72ed289733ba23fde3a2880164e29ffd3af SHA-256: aab92e366269ff6eed56baf160b32c58fdf04f1f497e233834b34efb8f091f6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised or disposable domains, disguised as a professional resume download. The presence of these links suggests an attempt to redirect users to malicious content or download further malware.

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://marty-triple-m.ch/inhalt/files/76987446900.pdf In PDF document text
    • http://sfera-vlad.ru/img/file/wegulozejufigezanivuxi.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/pemawetu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdb85048c---jivole.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/62555027850.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/25038814916.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf365b97b29---merimunovafowodemekaxamix.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c09342682---gizolegawepewet.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/surep.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/saguxevaxa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab9fe6e3c---puwunogijam.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/7544824684.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/42335171124.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160982e63185c5---30815721816.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f92cc0a2f2443e64adec351bdbc412ba/bolejikedozeguv.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/00037ae9825364743fc3a0bc7b3b0cfd/89362582189.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b1954b12---6284474172.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/wopas.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ac6fd6111---75783598046.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/lofujiduxo.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/98504004204.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf06233ea1---88295943596.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b5beb9811224092400410b0eaeec79c7/97506699376.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/piromeredetuletulorodi.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xorodoxasunibarerumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=professional+resume+pdf+free+downloadPDF 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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 17724 bytes
SHA-256: 321ad73fbe60385defac8e25b74246a89432771d6abf2264f612604e1dca3239
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10748 bytes
SHA-256: d9300b2b79c22e4c5c4fd77114e9687cc72d73fb8cb050ce82570167d915eaf9
font_02_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1